Check the appropriate box to
designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☐ Rule 13d-1(c)

☒
Rule 13d-1(d)

*

The remainder of this cover page shall be filled out for a reporting persons initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information
which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be
deemed to be filed for the purpose of Section 18 of the Securities Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act
(however, see the Notes).

Installed Building Systems, Inc. (IBS and, together with IBP Holding and PJAM, the Edwards
Entities);

Mr. Edwards and the Edwards Entities have entered into a Joint Filing Agreement, a copy of which is filed with this Schedule 13G as Exhibit 99.1, pursuant to which they have agreed to file this Schedule 13G jointly in accordance
with the provisions of Rule 13d-1(k) of the Act.

(b)

Address of the Principal Office or, if none, residence

For Mr. Edwards and each Edwards Entity:

c/o Installed Building Products, Inc.

495 South High Street, Suite 50

Columbus, OH 43215

(c)

Citizenship

Mr. Edwards is a citizen of the United States of America. IBP Holding and PJAM are corporations incorporated under the laws of the State of Ohio. Installed Building Systems, Inc. is a corporation incorporated under the laws
of the State of Delaware.

(d)

Title of Class of Securities

Common Stock, par value $0.01

(e)

CUSIP Number

45780R101

Item 3.

If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

Not Applicable

6

CUSIP No. 45780R101

Item 4.

Ownership.

Jeffrey W. Edwards

(a) Amount beneficially owned: 7,763,485

(b)
Percent of class: 24.4%*

(c)(i) Sole power to vote or to direct the vote: 504,800

(c)(ii) Shared power to vote or to direct the vote: 7,258,685

(c)(iii) Sole power to dispose or to direct the disposition of: 504,800

(c)(iv) Shared power to dispose or to direct the disposition of: 7,258,685

Mr. Edwards controls voting and disposition decisions with respect to the shares directly held by PJAM and IBS. Additionally, Mr. Edwards controls voting and disposition decisions with respect to 289,984 shares
directly held by Michael A. Edwards, as Trustee.

IBP Holding Company

(a) Amount beneficially owned: 4,027,819

(b)
Percent of class: 12.6%*

(c)(i) Sole power to vote or to direct the vote: 0

(c)(ii) Shared power to vote or to direct the vote: 4,027,819

(c)(iii) Sole power to dispose or to direct the disposition of: 0

(c)(iv) Shared power to dispose or to direct the disposition of: 4,027,819

IBP Holding is the sole shareholder of PJAM and is deemed to have voting and dispositive power over the shares directly held by PJAM.

PJAM IBP Holdings, Inc.

(a) Amount beneficially owned: 4,027,819

(b)
Percent of class: 12.6%*

(c)(i) Sole power to vote or to direct the vote: 0

(c)(ii) Shared power to vote or to direct the vote: 4,027,819

(c)(iii) Sole power to dispose or to direct the disposition of: 0

(c)(iv) Shared power to dispose or to direct the disposition of: 4,027,819

Installed Building Systems, Inc.

(a) Amount beneficially owned: 2,940,882

(b) Percent of class: 9.2%*

(c)(i) Sole power to vote or to direct the vote: 0

(c)(ii) Shared power to vote or to direct the vote: 2,940,882

(c)(iii) Sole power to dispose or to direct the disposition of: 0

(c)(iv) Shared power to dispose or to direct the disposition of: 2,940,882

*

The percentage amount is based on 31,862,561 shares of Common Stock outstanding as of October 30, 2017 as indicated by the Issuers Form 10-Q filed with the Securities
and Exchange Commission for the quarter ended September 30, 2017.

Item 5.

Ownership of Five Percent or Less of a Class.

If this statement is being filed to report the fact that
as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following ☐.

Item 6.

Ownership of More than Five Percent on Behalf of Another Person.

Not Applicable

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company.

Not Applicable

7

CUSIP No. 45780R101

Item 8.

Identification and Classification of Members of the Group.

Not Applicable

Item 9.

Notice of Dissolution of Group.

Not Applicable

Item 10.

Certification.

Not Applicable

8

CUSIP No. 45780R101

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: February 7, 2018

/s/ Jeffrey W. Edwards

Jeffrey W. Edwards (Individually)

IBP HOLDING COMPANY

By:

/s/ Jeffrey W. Edwards

Jeffrey W. Edwards

President

PJAM IBP HOLDINGS, INC.

By:

/s/ Jeffrey W. Edwards

Jeffrey W. Edwards

President

INSTALLED BUILDING SYSTEMS, INC.

By:

/s/ Jeffrey W. Edwards

Jeffrey W. Edwards

President

9

EX-99.1

EXHIBIT 99.1

JOINT FILING STATEMENT

The undersigned
hereby agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended,
and that all subsequent amendments to this statement on Schedule 13G may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements.